Gamma-ray Burst 160401A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 01 Apr 16 20:20:47 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    7437,   Sub_Num: 0
GRB_RA:          89.7460d {+05h 58m 59s} (J2000),
                 89.9997d {+06h 00m 00s} (current),
                 88.9656d {+05h 55m 52s} (1950)
GRB_DEC:        +26.6866d {+26d 41' 12"} (J2000),
                +26.6868d {+26d 41' 12"} (current),
                +26.6835d {+26d 41' 00"} (1950)
GRB_ERROR:      3.27 [arcmin, radius, statistical only]
GRB_INTEN:      8.20 [sigma]
GRB_TIME:       73242.71 SOD {20:20:42.71} UT
GRB_DATE:       17479 TJD;    92 DOY;   16/04/01
SC_RA:           83.65 [deg] (J2000)
SC_DEC:          22.01 [deg] (J2000)
SUN_POSTN:       11.53d {+00h 46m 07s}   +4.95d {+04d 57' 07"}
SUN_DIST:        77.48 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     298.17d {+19h 52m 41s}  -16.60d {-16d 36' 13"}
MOON_DIST:      152.02 [deg]
GAL_COORDS:     183.44,  1.40 [deg] galactic lon,lat of the burst
ECL_COORDS:      89.77,  3.25 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 01 Apr 16 20:21:04 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7437,   Sub_Num: 1
GRB_RA:          89.7328d {+05h 58m 56s} (J2000),
                 89.9865d {+05h 59m 57s} (current),
                 88.9525d {+05h 55m 49s} (1950)
GRB_DEC:        +26.6779d {+26d 40' 40"} (J2000),
                +26.6781d {+26d 40' 41"} (current),
                +26.6747d {+26d 40' 29"} (1950)
GRB_ERROR:      2.70 [arcmin, radius, statistical only]
GRB_INTEN:      16.52 [sigma]
GRB_TIME:       73255.71 SOD {20:20:55.71} UT
GRB_DATE:       17479 TJD;    92 DOY;   16/04/01
SC_RA:           83.65 [deg] (J2000)
SC_DEC:          22.01 [deg] (J2000)
SUN_POSTN:       11.53d {+00h 46m 08s}   +4.95d {+04d 57' 08"}
SUN_DIST:        77.47 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     298.17d {+19h 52m 42s}  -16.60d {-16d 36' 11"}
MOON_DIST:      152.01 [deg]
GAL_COORDS:     183.44,  1.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      89.76,  3.24 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 01 Apr 16 20:23:47 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7437,   Sub_Num: 2
GRB_RA:          89.7384d {+05h 58m 57s} (J2000),
                 89.9921d {+05h 59m 58s} (current),
                 88.9581d {+05h 55m 50s} (1950)
GRB_DEC:        +26.6786d {+26d 40' 43"} (J2000),
                +26.6788d {+26d 40' 44"} (current),
                +26.6754d {+26d 40' 32"} (1950)
GRB_ERROR:      2.60 [arcmin, radius, statistical only]
GRB_INTEN:      24.00 [sigma]
GRB_TIME:       73262.71 SOD {20:21:02.71} UT
GRB_DATE:       17479 TJD;    92 DOY;   16/04/01
SC_RA:           83.65 [deg] (J2000)
SC_DEC:          22.01 [deg] (J2000)
SUN_POSTN:       11.53d {+00h 46m 08s}   +4.95d {+04d 57' 10"}
SUN_DIST:        77.48 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     298.20d {+19h 52m 48s}  -16.60d {-16d 36' 00"}
MOON_DIST:      151.99 [deg]
GAL_COORDS:     183.44,  1.39 [deg] galactic lon,lat of the burst
ECL_COORDS:      89.77,  3.24 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 01 Apr 16 21:17:27 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    7437,   Sub_Num: 3
GRB_RA:          89.7376d {+05h 58m 57s} (J2000),
                 89.9912d {+05h 59m 58s} (current),
                 88.9572d {+05h 55m 50s} (1950)
GRB_DEC:        +26.6758d {+26d 40' 33"} (J2000),
                +26.6760d {+26d 40' 34"} (current),
                +26.6726d {+26d 40' 21"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      24.00 [sigma]
GRB_TIME:       73262.71 SOD {20:21:02.71} UT
GRB_DATE:       17479 TJD;    92 DOY;   16/04/01
SC_RA:           83.65 [deg] (J2000)
SC_DEC:          22.01 [deg] (J2000)
SUN_POSTN:       11.57d {+00h 46m 16s}   +4.97d {+04d 58' 02"}
SUN_DIST:        77.44 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     298.71d {+19h 54m 51s}  -16.53d {-16d 32' 00"}
MOON_DIST:      151.52 [deg]
GAL_COORDS:     183.45,  1.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      89.77,  3.24 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #19251
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 130 s has been detected by IBAS in the IBIS/ISGRI data at 20:20:30 UT of April 1, 2016.
The refined coordinates (J2000) are:
```
R.A.=  89.7377  deg
DEC.=  26.6758  deg
```
with an uncertainty of 2 arcmin (90% c.l.).
The burst had a peak flux of 0.7 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1e-6 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #19252
R. Rebolo, M. Serra Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias
V. Lipunov, E.Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Yurkov, Yu.Sergienko, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Teyde observatory was pointed to the GRB160401.85 (Mereghetti et al., GCN 19251) 7 sec after notice time and 15 sec after trigger time at 2016-04-01 20:20:57 UT. On our first (10s exposure) set we didn't find new optical transient within INTEGRAL error-box (ra=05 59 00 dec=+26 41 11 r=0.054) brighter then 16.3 (5-sigma upper limit).
The message may be cited.
GCN Circular #19253
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the INTEGRAL GRB 160401A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020603
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the INTEGRAL event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #19254
C. Guidorzi (U. Ferrara), A. Gomboc (U. Nova Gorica), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), on behalf of a large collaboration report:
The 2-m Liverpool Telescope automatically began observing INTEGRAL GRB 160401A (Mereghetti et al. GCN 19251) on April 01, 20:23:44 UT, i.e. 3.2 minutes since the GRB trigger time. From the subtraction of two 3x10-s r-band frames taken at 46 and 68 minutes post GRB trigger we do not detect any uncatalogued, significantly variable object within the INTEGRAL error circle down to r~20 mag calibrated against nearby USNOB-1 stars, in agreement with previous reports (Rebolo et al. GCN 19252).
GCN Circular #19255
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.), Coward, D. McPherson, D. Williams A., Martin R., Moore J., Dodson R. (UWA) report:
We imaged the field of GRB 160401A detected by Integral (Mereghetti et al. GCNC 19251) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 0.63 day after the GRB trigger as soon as the night became. The elevation of the field decreased from 27 degrees above horizon and weather conditions were good.
We co-added a series of exposures. We did not observed any new optical source than those in the SDSS in a radius of 2 arcmin centered ont the position RA=05:58:57 Dec=+26:40:33 J2000.0:
```
t1(d) t2(d)  Rmag_lim
0.63  0.66   19.0
```
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=183.4 lat= +1.4
GCN Circular #19256
Paul Kuin (MSSL/UCL) and L.M. McCauley (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160401 43ks s after the INTEGRAL trigger (Mereghetti et al., GCN Circ.19251). No optical afterglow consistent with the INTEGRAL position is detected in the initial UVOT exposures. The burst location was also observed by MASTER-IAC (Rebolo et al., GCN Circ. no. 19252); LT (Guidorzi et al. GCN Circ. no. 19254), and the Zadko observatory (Klotz et al. GCN Circ. 19255); none of whom observed an afterglow. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
  
white            43678        44209          522         >20.8 
v                44509        45370          843         >19.5
u                42847        43671          811         >19.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.13 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #19257
L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the INTEGRAL-detected burst GRB 160401A (Mereghetti et al. GCN Circ. 19251), collecting 2.9 ks of Photon Counting (PC) mode data between T0+42.9 ks and T0+49.1 ks.
No X-ray sources have been detected inside or close to the INTEGRAL error region. The 3-sigma upper limit in the field ranges from ~0.003 to ~0.005 ct s^-1, corresponding to a 0.3-10 keV observed flux of 1.3e-13 to 1.9e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
Four uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020603.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 03-Apr-2016 [Disclaimer]